A Simple Zucchini Gratin

I have such an over abundance of zucchini right now that I need to make something with them. They’re a somewhat boring vegetable, but just about any cooking technique can be used, and any other ingredients can be added, to make the humble zucchini shine. I chose to make a gratin with Gruyère, because I love cheesy gratins!

I served the gratin with a tomato salad to celebrate the end of summer. And the end of my garden.

There’s not much liquid in the gratin because it is a gratin, not a quiche.

A Simple Zucchini Gratin

5 small-to-medium zucchini, washed, de-stemmed
3 eggs
1 egg yolk
1/3 cup heavy cream
1/4 cup chopped parsley
1 tablespoon fresh thyme leaves
6 ounces Gruyère, grated
1 teaspoon salt
1/2 teaspoon white pepper

Preheat the oven to 350 degrees F. Butter a 9” round springform pan with a removable bottom.

Using a mandoline, and a silver mesh glove, thinly slice the zucchini. Make sure the slices are intact, and not partial slices.

In a large bowl, whisk together the eggs and cream. Then add the remaining ingredients, stir well, then carefully add the zucchini slices. Try to coat the zucchini as much as possible while being gentle.

Place the zucchini mixture in the prepared pan. Bake for 30-35 minutes, or until lightly browned, and there’s no more liquid.

Let sit for 15 minutes. If cool enough, remove the side of the pan.

Gently slice into pie shapes and serve warm.

Certainly other cheeses can be used in gratins in general, like fontina, smoked mozzarella, raclette, reblochon, or cheddar and Monterrey jack.

By Published On: October 9th, 202529 Comments on A Simple Zucchini Gratin

About the Author: Chef Mimi

As a self-taught home cook, with many years in the culinary profession, I am passionate about all things food-related. Especially eating!

29 Comments

  1. Travel Gourmet October 9, 2025 at 6:07 AM - Reply

    This would make a delicious lunch. I like courgettes a lot so don’t find them boring but nice to have another way of eating them.

    • Chef Mimi October 9, 2025 at 7:53 AM - Reply

      Well if I just steam them they’re boring. That’s what I meant. I do love them raw in salads.

  2. johnrieber October 9, 2025 at 7:35 AM - Reply

    I love Zucchini and this is a terrific use of them!

    • Chef Mimi October 9, 2025 at 7:53 AM - Reply

      Thanks, John!

  3. cookingwithauntjuju.com October 9, 2025 at 8:20 AM - Reply

    I remember those days of an over abundance of zucchini. Some times I would let them go and the kids would make a game of “who could find the biggest zucchini.” Good way to use a few zucchini and with cheese – yes :)

    • Chef Mimi October 9, 2025 at 8:26 AM - Reply

      Funny! I have found quite a few baseball bat zucchinis before!!!

      • Gerlinde aka sunnycovechef October 12, 2025 at 7:40 PM

        It’s a sad story, but my zucchini plants are not producing at all. I do love your gratin.

      • Chef Mimi October 13, 2025 at 9:22 AM

        Oh I’m sorry. Mine don’t do well at all if we have too much rain.

  4. Anonymous October 9, 2025 at 9:05 AM - Reply

    Simple and perfect! Gruyère improves almost everything! The tomato salad is perfect with the gratin. Gorgeous photo! Barb

    • Chef Mimi October 9, 2025 at 10:58 AM - Reply

      Gruyère is fabulous! I agree! Thanks.

  5. Anonymous October 9, 2025 at 12:22 PM - Reply

    Thanks Mimi – – – this looks delicious and I will do! – – – Susan

  6. Charlie DeSando October 9, 2025 at 4:11 PM - Reply

    Simple and tasty, very nice

  7. David Scott Allen October 9, 2025 at 4:28 PM - Reply

    Looks delicious, and a great way to use an abundance of zucchini!

  8. Tandy (Lavender and Lime ) October 9, 2025 at 10:53 PM - Reply

    I am going to make this for sure as we love zucchini!

  9. sherry October 9, 2025 at 11:10 PM - Reply

    This looks fabulous Mimi. I don’t mind a bit of zucchini! Yum.
    sherry

  10. Anonymous October 9, 2025 at 11:54 PM - Reply

    A wonderful and delicious way to use up zucchini!

  11. Healthy World Cuisine October 10, 2025 at 6:48 AM - Reply

    Love this simple but extra delicious zucchini garden. We would eat this any time of the day. Great way to enjoy the end of the summer’s harvest.

    • Chef Mimi October 10, 2025 at 3:58 PM - Reply

      Exactly! Thanks, Bobbi

  12. David @ Spicedblog October 10, 2025 at 6:51 AM - Reply

    I agree that zucchini tend to be a bit boring…but on the other hand (as you pointed out) the lack of strong flavor means they are good options for all sorts of other recipes. This gratin sounds simple but delicious!

    • Chef Mimi October 10, 2025 at 3:59 PM - Reply

      Thanks so much David!

  13. Frank | Memorie di Angelina October 10, 2025 at 3:09 PM - Reply

    I actually like zucchini! Their mild flavor can be a virtue since as you say, they lend themselves to all sorts of pairings. This gratin is a perfect example!

    • Chef Mimi October 10, 2025 at 3:59 PM - Reply

      I love all vegetables! Zucchini and tomatoes do the best in my garden.

  14. Ann Coleman October 10, 2025 at 9:12 PM - Reply

    That looks like a wonderful and delicious way to use your zucchini!

    • Chef Mimi October 11, 2025 at 8:26 AM - Reply

      Thank you Ann!

  15. basketball stars October 12, 2025 at 1:50 AM - Reply

    Heck, Ive got zucchinis bigger than the ones those kids found! This sounds like the perfect way to turn my baseball bat zucchini into something delicious and maybe even stop my neighbor from stealing them off my porch. Cant wait to try this with Gruyère – sounds like even my least favorite zucchini would be begging for a slice! 😄 Chef Mimi, youre a lifesaver during zucchini season!basketball stars

  16. Ben | Havocinthekitchen October 13, 2025 at 10:28 AM - Reply

    This zucchini gratin looks so comforting and delicious – a perfect way to celebrate the garden’s bounty!

    • Chef Mimi October 13, 2025 at 12:21 PM - Reply

      Thanks so much Ben!

  17. Karen October 13, 2025 at 12:01 PM - Reply

    Sounds like a great and delicious way to use those multiplying zucchini.

    • Chef Mimi October 13, 2025 at 12:22 PM - Reply

      Thanks, Karen!

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